Resumo

ANCHANTE-HERNANDEZ, Henry et al. Comparison between cardiac stimulation in the outflow tract and right ventricular apex . Rev Med Hered [online]. 2013, vol.24, n.1, pp.06-11. ISSN 1018-130X.

The right ventricular apex (RVA) is the conventional pacing site, however, but it does not induce a pattern of activation and physiological synchrony. The evidence of its deleterious effect has raised questions about the traditional practice and therefore, an alternative site is being searched. The right ventricle outflow tract (RVOT) has proven to be a suitable site for stimulation, with not difference in stimulation thresholds between the two sites. Objective: Compare the outcomes of the implantation of pacemakers in the apex and in the outflow tract of the right ventricle. Methods: A descriptive and retrospective case series. We included 54 patients with pacemaker implantation between 2010 and 2011. Patient records were reviewed for clinical data, implant itself and its complications. Results: Mean age was 73.7 years. The most common indication for implantation was atrioventricular block (55.6%). The path to address ventricular electrode was through left cephalic vein dissection (76.7%). The stimulation was achieved 66.7% in RVA and 33.3% in RVOT. The most common complication pocket hematoma (7.4%). No differences were evident in the stimulation parameters and stimulation thresholds in both groups. Conclusions: RVOT has proven to be a suitable site for stimulation, no differences were found in stimulation thresholds or the RVA impedance.

Palavras-chave : Artificial cardiac pacing; heart ventricles.

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